Stop motion for perforating machines



Patented Sept. 19,1922.v

' 4 SHEETS-SHEET k 5 7 2 6 i 5 5 m 2 m m 2! rllll I- B WW, w

APPLICATION fllED FEB. I2, I919.

WITNESSES:

D. NOBLE.

STOP MOTION FOR PERFORATING MACHINES.

' APPLICATION FILED FEB. 12, I919. 1,429,44?

D. NOBLE.

STOP MOTION FOR PERFORATING MACHINES. APPLICATION FILED'FEB. 12, 1919.

Patentedfipt. 19,1922

4 SHEETSSHEET 3.

WITNESSES:

Zigg- I NVENTOR Dana/d Noble TORNEY D. NOBLE. STOP MOTION FOR PERFORATING MACHINES. APPLICATION men m. 12. I919.

1,429,447. Pgtentedsept. 19, 1922.

4 SHEETSQSHEET 4.

' WITNESS INVENTOR .ah ld jl bble ATTORNEY tain new and useful Patented Sept. 19, 1922,

rrsn rare DONALD NOBLE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE SINGER MANEL FACTURING COMLPANY, A CORPORATION OF NEW JERSEY.

sror MOTION ron rnnronarms MACHINES.

Application'filedFebruary 12,1919. Serial No. 276,610.

To all whom it may concern Be it known'that I, DONALD N BLE, a subject of the King of Great Britain, residing at Bridgeport, i the county of Faii'field and State of Connecticut, have invented cer- Improvements in Stop Motions for Perforating Machines, of which .the following is a specification, reference being had therein to the accompanying drawings. y y i A The'present invention relates to improvements in stop motion mechanism for perforating machines,and particularly to stop motion mechanism for machines of this class used in the manufacture of shoes for producing the lines of ornamental perforations commonly formed along the edges of the pieces of leather or other material composing the shoe upper. A type of this machine is illustrated in the application of Noble, Ser. No. 232,744, filed May 6, 1918, the present application being in part a division of the same. i

The invention consists in the provision of driving and stop mechanism comprising a clutch and stop device of the general form shown in the patent to Cornely, #852,598, May 7, 1917. In the general disclosure such clutch has been modified in various particulars, among which iently support-ed stop bolt serving to prevent breakage of the parts under certain conditions of starting. v

The invention further consists in the provision of a stop motion device operable either at the will of the operator as by means of a treadle, or which may be placed under the control of av feeler finger resting upon the work and adapted to stop the machine when the line of perforations has reached a predetermined distance from the edge thereof, such feeler being in the form of an attachment'readily fixable in operative position.

The invention further comprises a stop motion mechanism which, when under control of the operator, may operate to stop the machine after each successive operation, or which may stop the machine only when positively operated bythe operator.

-The invention further consists in the provision of locking means .for the drive mechanism,whereby any accidental movementof parts may be prevented; as

the operative for example, when it is desired to change or is the provision of a resiladjust the punches, thus avoiding possible breakage of the machine or injury to the operator.

Other and further desirable features of the invention,together with improved details of construction and combinations of parts, will be hereinafter more fully de-' scribed and claimed, reference being had to,

the accompanying drawings for a complete disclosure of the same, and in which,-

t elevation of a machine 1 1g 1 1s a 1101i embodying my invention with parts broken away to showthe interior construction;

Fig. 2 is an elevation from the left hand end of the machine on an' enlarged scale, partly broken awayto show the interior construction; i

"FigLf3 is'a vertical cross section on a fun.

th'er'enlarged scale on the line B-B of Fig. 1; I Fig. 4 is an enlarged detail fragmentary front elevation illustrating a portion of the stopinechanism;

Fig. 5 is a sectional detail View ofjthe clutch and related parts; i

Fig. .6 is a detail,'sectional elevationtaken at right anglesto Fig. 5'; Fig. 7 is a detail,sectional view of a safety device employed;

Fig. Sis a detail view of the, feeler fingerv supporting bracket; Figf9 is a side elevation of the treadle and connection rod, g i Fig. 10 is a fragmentary front elevation showing a fingercontrol which may be applied to the stopmotion; and

ber.

The numeral 1 indicates the base of the machine, having rising therefrom at its right hand end a column or post 2, carrying an overhanging arm 3. The base member, post and arm" are provided with a series of cavities 4, 5 and 7 enclosing the greater part of the mechanism of the machine, removable cover plates being provided at 8 and 9, which may be secured in any suitable man-- ner. The cover plate 8 is provided with 21 depending bracket 11 serving. to support a certain part of the mechanism hereinafter described. i

12 is the main drive shaft of the machine Fig. 11 is a plan of the finger control'memjournaled in the upper portion of the cavity shaft 12 and journaled in a boss 16 at the upper right hand portion of the column or post 2, said drive shaft 19 being provided with any well known form of fast and loose pulley drive indicated generally by the numeral 14.

The drive shaft 12 which is driven by drive shaft 19, in a manner hereinafter described, has fast thereon adjacent the left hand end thereof a sleeve member 54, having formed thereon a pair of spaced apart cams 51 and 50. Mounted to rock upon a stub shaft 43, supported in a pair of brackets 42, projecting from the rear face of the over hanging arm 3, are inwardly extending arms 44, 45 adjustably fixed in relation to one another, and provided at their inner extremities with rollers 52 and 53, mounted upon pins 58, 58. Arms 44 and 45 are rocked upon the stub shaft 43 by the earns 51 and 50, fast upon the drive shaft 12, and serve to impart a vertical reciprocatory motion to the punch mechanism presently to be described.

The punch mechanism comprises a punch carrying shank 67, having secured thereto at its lower end a cluster of punches 76. The punch carrying shank is slidably mounted for vertical movement in sleeves 65, 66 formed in a bracket 64 pivoted within the cavity 4 of the overhanging arm 3 to swing in an are about the pivots 61 and 62. Links 59 and .60, pivotally connected at 70 upon either side of the punch carrying shank 67 adjacent the lower end thereof, are pivotally connected at the inner extremity of the arm 44 by the pin 58. It is obvious that the punches and punch-carrying shank will re ceive a positive vertical reciprocatory motion within the sleeves 65, 66 of the bracket 64 through the connection of links 59 and 60 to arms 44 and 45, which arms as before mentioned are rocked in a vertical plane on stub shaft 43 through the medium of cams 50, 51 on the drive shaft 12.

Pivotally mounted at 107, to the arm 3, is a rocker lever 108 which receives a rock ing motion from the drive shaft 12 through an eccentric 111 fast upon the end of said shaft 12 and connected by an eccentric strap and connecting rod 112 to said rocker lever 108 at 103. The lower arcuate portion of lever 108 is slotted at 110. An adjustable I rod 116 is pivotally connected at one end as at 115 to the swinging bracket 64 adjacent sleeve 66, the opposite end of said rod 116 being pivotally connected to a bolt 117, said bolt 117 having sliding engagement within the slot 110 and being adjustably positioned therein by clamping nut 118. By means of the above described devices a swinging motion is imparted to the punchcarrying shank 67, together with the bracket 64 about the pivots 61 and 62, whereby the work is fed along the work table 127 by the punches 7 6 in cooperation with a'presser foot mechanism, a brief description of which follows.

Mounted to slide vertically within the depending bracket 11 of cover plate 8, is a spring-pressed presser foot bar 96, having mounted at the lower extremity thereof a presser foot 105 arranged to rest upon the work at a suitable point adjacent the rearmost limit of travel of the feeding movement of the punch. At its upper end the presser foot bar 96 is provided with a toe 99 adapted to take over a lug 100 formed upon the outer extremity of an arm 101 of a lever 102 pivoted upon the stub shaft 43 adjacent the lever 45, said lever being provided with a second arm 103 arranged for engagement by a cam 104 fixed upon the shaft 12. It is evident that upon the rotation of the shaft 12, the cam 104 will lift the lever 102 thereby raising the presser foot bar 96 against the action of the spring 98, such action of the presser foot being necessary for the proper feeding of the work. Fixed to the upper portion of the presserfoot bar 96 is a collar 96, said collar having projecting downwardly therefrom a rod 96 designed to contact with a finger lever 2552 hereinafter referred to, and whereby said presser foot is raised as occasion may require. The base member 1 is provided beneath the punch and presser-foot mechanism with a raised portion 126 upon which is secured the previously mentioned work plate 127. A vertically adjustable anvil 129 is provided in an opening 129 located centrally of the said raised portion 126, said anvil 129 being designed to receive the blow of the punches.

As the previously described mechanism forms no particular part of the present invention, but is merely illustrative of a type of machine to which said invention is applicable, it is thought that the foregoing description of the same is sufficient to impart a clear understanding of the relation of said mechanism to the invention proper, a detailed description of which follows.

The stop-clutch mechanism, whereby the operation of the machine is closely controlled and by means of which said machine is caused to stop automatically when the line of perforations in the material has approached to within a predetermined distance of the edge of the material, comprises the following devices.

In the inner extremity of the drive shaft 19 and within the cavity 5 of post 2 is fixed a collar 33 provided with a pair of diametrically opposed openings 34. The right hand end of the drive shaft 12, which is telescoped within the drive shaft 19, has fixed thereon an eccentric 35, provided with an eccentric strap 36 and connecting rod 37. Eccentric 35 and connecting rod 37 serve to actuate mechanism to operate paper feed device (not shown) and which, forming no part of this invention, tion. The eccentric 35 is provided with collar 38, and an opening '35 is provided through said eccentric 35 and collar 38 located at the same radial distance from the shaft 12 as are openings 34. Adjacent the collar 38 is a cam sleeve 40,- freely slidable upon the shaft 12, and provided with a pin 39 slidably guided within the opening through the collar 38 and eccentric 35, and

adapted to engage with either of the openings 34 of collar 33, said pin thus serving as a clutch elementwhereby the drive shaft 19 may be connected with the drive shaft cam sleeve 40. The lower extremity of the cam lever is provided with a cam incline 207 (see Fig. 4) for a purpose presently apparent. A slidable dog 209, having a shoul der 210, is arranged for vertical sliding movement within a suitable guide opening in the bracket 200, said dog being carried upon the upper end of a rod 208 extending downwardly to a point below said bracket 200, and provided at its lower end with an adjustably fixed collar 211. The dog 209 is normally held in its upper position by means of a compression spring 212 located within a cavity in the bracket 200, such dog when in projected position presenting its shoulder 210 in the path of the lower extremity of lever 204. YVhen the dog 209 is inits projected position the lower end of the lever 204 is prevented from swing ing to the left of its position, illustrated in Fig. 1. It is readily apparent, withthe dog 209 and lever 204 in the above described positions, that rotation of shaft 12, together with, cam sleeve 40, will. cause said sleeve 40 to be moved longitudinally of the shaft 12 against the action'of the coil spring 41, thereby withdrawing the pin 39 from the opening 34 in collar 33, and thus unlocking the shaft 12 from the shaft 19 (the position illustrated in Fig. 1). 213 is a second cam fixed to the sleeve 40 and movable therewith. The cam 213 is provided with a raised cam portion 214 of gradually in-' creasing height, following'which is an abrupt depressionor'notch 215 having a stop requires no descrlpshoulder 216 forming one wall thereof. A stop dog 217 is mounted within a slot 218 in the'rear of thebracke't 200, said stop dog comprising a suitably formed end "portion for engagement with the cam 214 andnotch 215, and having extending downwardly therefrom a tail member 220 mounted for sliding movement in asuitable opening in pin 221, which pinis pivotally mounted in theside walls of the'slot 218. A compres sion spring 222 surrounds said tail member 220,"said spring bearing upon the lower pore tion of the dog 217 at one end,--and against the pin 221 at the other end tending to normally maintain the dog in its-uppermost position for engagement withthe cam 213..

Look nuts223 prevent the dog from being entirely projected out of the pin 221.

The dog against rearward movement about its pivot pin 221 by engagement with a bearing plate 225 carried upon the forwardend of a rod 225, said rod passing'loosely through a guiding opening 226 formed in a'bos's proj ecting from the rear of "post 2. Surrounding the pin is a stiff coil spring 228 bearing at one, end against a plate 225 and 217 is resiliently supported having its opposite end seated in a pocket formed in the'interior of said projecting boss, the rod 225' having a washer 227 mounted thereon exterior of said boss and bearing against the same to limit the forward movement of the rod under action of the spring 225, said washer being held in pogition by a nut upon the end of said roc. 1 3

When the driveclutch mechanism is in operative position, the dog 217 is in a plane to the left of the plane of rotation-of cam 213, and therefore fails to contact with the latter. Upon projection, however, of the dog 209 into the path of oscillation of lever 204,"the cam sleeve 40, as above described, will be caused to move along the shaft 12 to the left, thereby causing a removal'of the pin '39 from the opening 34. "Simultaneously with this movement the cam 213 is brought into the path "or the dog 217, thetiming of the parts being such that the dog 217 will contact initially with the lower portion of the cam 213. As said cam continues to revolve, the portion 214 thereof contactingwith the dog 217, tends to'depress the latter against the action of spring 222, while "at the same time greatly retard-- ing the momentum of the shaft 12 and the parts operated thereby. As the dog 217 reaches the notch 215 it thereinto andis brought into contact with the stop shoulder 216, thus servingfito positively stop the rotation of the shaft 12.

snaps abruptly It has been found in practice when 're'- lee sometimes caused to strike the dog 217, while positively driven by the shaft 19. Under such circumstances a breakage of the parts would be likely to occur, and to avoid this the dog 217, as has been herein shown, has been resiliently mounted for swinging movement against compression spring 218. With the present construction, if the blow of the shoulder 216 against the dog 217 be of sufiicient intensity, said dog will give slightlyin a rearward direction against the action of the spring 218, permitting the cam to slip past the same. As the pin 39 will generally properly seat it self before the second rotation, the cam 213 will, in mos-o cases, not strike said dog 217 a second time, and in any case the latter is saved from brealnagev Furthermore, by reason of the resilient mounting of the dog, the, shock in stopping the machine under normal circumstances is somewhat lessened, the dog tending to move backward slightly under impact of the shoulder 216, and then moving forward slightly, thus bringing the parts to proper stopping position.

Pivoted upon a lug within the chamber 5 and adjacent the lower end of the member 208, is a lever 230, said lever being forked at itsvright hand extremity, as indicated at 231, to receive member 208, the said forked extremity being located above the collar 211. Pivotally mounted at the opposite end of the lever 230 is a latch member 233 normally thrown forward by a coil spring 23% mounted in a pocket in the lever 230, and bearing against the lower portion of latch member 230. The upper extremity of the latch 233 is provided with an overhanging shoulder 235 and a cam portion 236. v v

A latch plate 237 is suitably secured against the inner wall of the post 2 adjacent the latch member 233, said plate being provided with a horizontal portion 238 form ing a fixed abutment adapted for engagement with the shoulder 235 of latch 233. A pin 239 passes through the wall of the post 2 at the left of latch 233, and is provided with an enlar ed head 240. A spring 241 normally retains the pin in retracted position, and out of contact with latch member 233.

Mounted for pivotal movement in a lug uponv the rear of post 2, and in a journal opening in the lower portion of bracket 106 is a shaft 243, said shaft being suitably secured against endwise movement by set collars 24:4; and 24-5 fixed thereon. 246 is an, opening through. the rear wall of post 2 leading into chamber 5 adjacent the upper end of latch 233;

Fixed upon the shaft 243 and projecting through the opening 246 is a lever 247. Upon the forward extremity of lever 2&7 is a cam member 248, said cam member being adapted for engagement with the'upper cam portion 236 of latch 233 and being I provided at its upper end portion with a small weight 2 1-9. Near the opposite extremity of the shaft 243, and fast thereon, is a finger lever 250 which projects through a suitable opening 25lnformed in the depending bracket 11, and is provided at its forward extremity with a finger piece 252. Movement of the member 252 in an upward direction thus serves to lift the cam mem ber 2&8 out of engagement with the cam portion 236 of latch 233. A pin locking arrangement 253 is provided to be normally held out of the path of the finger lever 250 but which may be projected into the path thereof when said lever has been raised to thereby hold the same in. elevated position, said pin beingsubstantially identical in construction with pin 268 hereinafter described in detail. By liftingthe lever arm 250 the cam member24c8 will be raised, and through contact of said lever with the lower end of rod 96 previously described the presser foot will also be raised. 7

At its left hand extremity (as shown in Fig. 2,) the shaft is provided with a fixed lever arm 25%, said lever arm having an opening 255 at its forward end and passing therethrough. 256 is a bracket in the form of a cylindrical rod fixed within the member 11 and projecting to the-left thereof. 257 is aT-shaped bracket having vertical and horizontal sleeve portions, the

horizontal )crtionthereof bein arranged:

to slip over the free extremity of rod 256 and to be remo vably secured thereto by any suitable means, such for example (Fig. 8) as a spring clip 258 adapted for engagement with. a notch 258 formed in rod 25.6. The vertical portion of said bracket 25? forms a guideway in which is mounted for sliding movement a feeler finger 259, said feeler finger being formed its upper extremity with bent portion adapted for insertion in the opening 255 of lever arm 254. The feeler finger is of such length as to reach downwardly tothe work table .127, and to be supported in raised position by resting upon the upper surface of the work lying upon said table. The table at a point in alignment with the feeler finger be provided with an opening 260, if desired, permitting the extremity of the feeler finger to move downwardly to a point slightly below the surface of the work table.

By the above described construction for the feeler finger mounting said feeler finger may be readily removed from the machine by merely slipping the bracket 25? from OH the extremity of the member 256 and detaching the upper end of said finger from the opening in the lever arm 254.

Pivotally mounted at one end thereof, in a bracket 261 within the chamber 7 of base 1, is lever 262, said lever projectingto. the

right to a point substantially beneath the lever 230 at which point lever 262 is provided with an outstanding pin 263.. Upon the rear extremity of a rock shaft 264, jour- 111 a central position to rock the rock shaft 26.4,as desired.

Asa substitute for or in addition to, the treadledevice 267 a fingercontrol, shown in Figs, 10. and 11 may be used. This conslsts of a'finger lever 265i rigidly mounted onthe forward end of shaft 264, being detachably" fastened thereto by the thumb screw 264 Lever 265 projects to the left of shaft 264, and isprovided .at its free end with an outwardly extending finger-piece 267% It-is also provided with an inwardly turned portion 265 having a lug onits under side projecting within the upper end of a coil spring 265, which is seated in a suitable depression in the basel.

A yoke member 268 is fixedlymounted upon the shaft 264 the upper portion thereof. being located directly beneath the pin 263. The upper edge of said yoke member provides a cam surface comprising a central portion 269 concentric with the axis of the shaft 264, and having at either end thereof depressions 270, 271 adapted to receive pin 263. 272 is a bar vertically movable in an opening 273 in the frame 1, and having its lower end resting upon lever 262, and its upper end'contacting with lever 230 at a point adjacent latch 233.

Theyoke member 268 is provided with an opening 268 adapted for engagement by the extremity of a pin 268 slidable within a sleeve'268 fixed within the base 1. The shank of the pin'268 is provided with a thumb nut 268 and a transversely extending pin 268 adapted to engage within a slot 268 extending transversely. of the end of the sleeve 268 A coil spring surrounds the shank of the pin 268 and tends to normally project the extremity of the same into the opening 268 of yoke member 268. By withdrawing the pin from the opening 268 in the yoke member and giving the same a. quarter turn, thereby disengaging pin 268? from transverse slot 268', said pin may be retained'out of engagement withsaid opening 268 of the yoke member. Upon turning 'the'thumb nut 268 so that pin 268 registers with slot 268; the pm 268 will'again enter the opening. 268 and hold the yoke member 268' against rocking. movement. As in djiistments of parts adjacent thereto it is vgers beneath the punch'carrier, it is "with thus coupling drivev shaft changing the punches and making various necessary for the operator to place his findesirable to prevent accidental movement: of the treadle such as might cause" injury to the operator by accidentalstarting of the machine at this time. and pin 268 has therefore been provided',.said pin constituting a safety device to lock shaft 264 against actuation. p I i The operation of 'the device is as follows -with the feeler finger and the various the machine in the position illusparts of Fig. 1, the clutch pin 39 being'out trated 'n ,of engagement with the opening 34, the

operator will first lift the finger piece 252, thereby rocking the shaft 243 and lifting the feeler finger through lever 254. Continued movement of the shaft 243 brings the lever 250 into contact with rod 96 and lifts the presser foot, and the work may now be introduced beneath the same upon table 127. Uponrelease of the finger piece 252,.the lever 254 will drop until the feeler finger 259 rests upon and is supported by the work,

and further turning of shaft 243 is 'pre vented. ,Owing to the factthat the lever 250 does not immediately contact with the rod 96 toraiseth'e presser foot, said pre'sser foot will be permitted to movedownwardly into contact with the work, even though the lever 250 is held in partially raised position by the feeler finger.

Due to the fact that the feeler finger is supported upon the surface of the work, cam

member 248 is heldin elevated position, and

out of contactwith cam surface 236 of latch 233. In order to now start the machine the operator will depress the treadle 267 sufficiently to bring the pin 263 into engagement with the portion 269 of yoke268, thereby first raising thebar 272'intoengagement with lever 230 rocking the latter in a clockwise direction, and as the yoke swings further permitting saidbar to drop into'the depression 270. The forked end. 231 of lever 230, through engagement with the collar 211 upon the lower extremity of member 208, causes a depression of the dog 209 against the action of its lifting spring withdrawing the shoulder 210 of'the'same from the path of the oscillating lever 204". As the drive shaft 19 rotates continuously, the openings 34in disc 33 are successively brought opposite the extremity of pin39. Owing to the action of the compressionsprmg 41 an about its pivot 203, the pin 39 is engaged within the first opening 34 registering thered the lever 204 now belng free to oscillate 19 to drive Fit ' the abutment 238 thereof snaps over the same, the cam member 2428, as above stated, being disengaged from the cam surface 236, of latch 233. Engagement of the latch 233 with said abutment thus holds the dog 209 down out of the path of movement of the lower extremity of lever 204: whereby the machine is permitted to operate continuously.

While the machine is operating under the control of the feeler linger 259 with the latch 233 in engagement with the abutment 238, the cam incline 207 of lever 20% wipes across the upper extremity of the dog 209 at each oscillation of said lever, thus slightly depressing the dog against the action of spring 212, thereby tending to slightly lift the shoulder 2-35 of lever 233 from the abutment 238. As, however, the cam member 2&8 is at this time lifted entirely free of the end of said latch, thereis no tendency of the latch to slip ofii from the abutment 238, the spring 234 being su'flicient to retain the shoulder 235 of said latch in position to engage the abutment 238 immediately upon release of the dog 209 as the cam incline 207 swings from over the same. The lifting of said latch from frictional engagement with the shoulder 238 renders the latch very delicate in operation, so that the cam member 248 and the feeler finger 259 may be made very light in weight and consequently extremely quick and sensitive in action.

The machine will continue to form a series of perforations until the feeler finger, resting upon the work in advance of the presser foot, rides oil the edge ofsaidworl: as the same is fed toward the punch. The feeler linger immediately drops of its own weight into the opening 260 in the work table, thcrel y permitting the cam member 24:8 to fall into engagement with cam surface 236 of latch 233, thus forcing the same off the abutment 238, thereby permitting the latch member 233 together with the latch carrying end of lever 230 to drop. The dog 209 immediately rises under the action of its spring into the path of the lower end oflever 204:, the oscillation of which is immediately stopped causing a sliding movement of the sleeve 4L0 along the shaft 12, thus disengaging the pin 30 from the opening 34- and simultaneously engaging the stop shoulder 216 with the stop dog 217 to stop the rotation of shaft 12. Upon raising the finger piece 252, the operation previously described is repeated.

The stop mechanism may be operated to stop the machine at any time during its operation by pushing inwardly upon the head 240 of the pin 239, which operation forces the latch from engagement with thereby permitting said latch to fall and the dog 209 to rise in the same manner as above indicated to cause a disengagement of the clutch mechanism.

1 ssam The feeler finger and stop mechanism, as above described, is of special use when the machine is employed for forming the perforations upon the blanks intended to form the tips of tions begins and terminates at a considerable distance from the opposite edges of the blank. The operator is enabled by this de vice to insert the material to a point such that the first perforation will be at the desired distance from the starting edge and then by proper setting of the feeler' finger insure the stopping of the machine with the punch at a corresponding distance from the final edge of the piece of material passed through the machine.

ll hen it is desired to use the machine without the feeler.mechanism, the same may be readily removed from the machine as previously described, ti machinenow being entirely under the control of the operator. Under these conditions, and to control the machine when performing acontinuous shoes, in which. the line of perfora series of operations, the operator in first introducing the fabric, lifts and then releases the finger member 252, thus raising the presser foot and cam member 248, and permitting the same to fall again, cam member 24-8 when in the latter position preventing latch from engaging abutment The treadle is now depressed to its central position whereby the pin 2 63 rides upon the concentric port-ion 269 of rocker arm 268, the forli'ed ezztreniityof the lever 230 thus being held in downward position depressing the dog 209 and permitting the machine, to start into operation. 550 long as the treadle is held in its central position, them'achine will con tinue to operate, the dog 209 being held in its lowermost position, but, upon further depression of the treadle from its central position in either direction, the pin 263 will drop into one or the other of the depressions 270, 27. thereby permitting the latch carrying end of lever 230 to drop and allowing the dog 209 to rise into stopping position.

As in the before described operation the cam 24:8, starting the machine has been permitted to drop, the latch 233 was prevented from. engaging the abutment 238. and thus as the treadle is further depressed, as above indicated, the latch to prevent dropping of lever in. the manner stated and the machine will be brought to rest.

If it desired that the machine make but a single perforation and then come to rest, the operator, after inserting thcwork, will depress the treadle member from one extreme position to theother. By somoving the treadle the pin 263 will be caused-to travel from one of the depressions 270, 2Y1 to the other, but midway of its travel the pin will be elevated by cam portion:269 of yoke 268, thereby lifting the latch carrying lever 230, latch 233, however, being premore complete cycles of movement and then Stop, the number of such cycles depending upon the rapidity of movement of the treadle. This arrangement is of advantage under conditions involving extremely sharp changes of direction of feed 'movement of the work and wherein with the machine continuously operating it is difficult to prevent running off of the edgeof the material. If inoperating the machine as just. described the operator should retain member 252 inmachines comprising devicesactuable'by manualor automatic means for stopping the Q vmachine, in combinationpalzttch arranged elevated position while actuating the treadle, the latch might become engaged with abutment 238, and as the weight of cam member 24S alone is insufficient to disengage the latch 233 from abutment 238, owing to frictional engagement between said parts,'the machine would be kept in continuous action.

To avoid such accidental occurrences, the cam incline 207 of oscillatinglever 204 has been provided which, in swinging over the top of dog 209, causes a slight additional depression of the same. The cam 207*thus produces a slight upward movement of thelatch carrying end of lever 230 sufficient to reduce the frictional engagement between the shoulder 235 and abutment 238, as above de-' scribed, and to such'an extent as to permit cam member 248 to disengage the latch from said abutment, permitting the dog 209 to rise to such a position that upon the next successive oscillation of the lever 20 i the clutch will be thrown out of operation and the machine brought to a 'rest.

It is evident that if it is desired to control the stop motion by means of the finger actuation instead of by the treadle, it can be accomplished by proper manipulation of the finger lever, it being understood that in this case pin 263 should always engage notch- 270 when the machine is stopped. A depression of the finger lever willthen serve to start the machine, which will run as lon'gas the lever is depressed, and will stop as soon' as the lever is released.

While apreferred embodiment of the, in-

vention has been described and illustrated,

it is to be understood that such changes in structure. and modification of detail are contemplated as fall within the scope of the appended claims. V Having thus fully describedthe invention and the construction and operation of mechanism inoperative in the normal run a machine embodying the same what is claimedas new is, a a i 1. In a perforating machine a drive mechanism including a clutch device, means movable in opposite directions for controlling the operation thereof, andconnections from said means to said clutch device whereby when sald means 1S held in its central position the clutch drives continuously materiaha latch member for rendering said stop mechanism inoperative during the normal operation of themaclnne, and means actuated upon disengagement of said finger from the material .for releasing said late he and-thereby permitting "operation of the stop mechanism. 5. v

3. In a stop mechanism for, perforating to normally prevent operation of the stop mechanism when the machlne is under aumeans for rendering said latch" ineffective when the machine is under manual control.

4.1 In a perforating machine a stop mechanism, a fixed abutment, a latch member 'engaging said abutment in'the normaliopera tion of the machine and while so engaged tomatic control and I automatically acting rendering the stop mechanism inactive,

cam-incline uponsaid latch member, a workengagingfee'lerv finger, and a cam member adjacent said cam incline, normally held out of contact therewith'by connections to said finger, but adapted upon actuation of the latter to engage said cam incline and thereoperative independently of thefirst-named by release said latch from the abutment.

means for discontinuing such operations at a predetermined distance fromthe-edge of such'material 6.'In a perforating'machine having automatically actuated stop mechanism, a, work 'liOlCling presser foot, a-stop actuating feeler finger, and a manually operated.

member arranged for simultaneously lifting said foot and said fingerftopermit' the introduction of work thereunder.

7. In a perforating machine, a stop mechanism, a fixed abutment,'a latch i"en-- gageablel with said abutmentforholding said ning of the machine, a cam incline on said latch member, a shaft,a weighted lever arm fixed upon said shaft, a cam member carried by said lever arm and ad acent said cam incline, a second lever arm fast to said shaft, and a feeler finger connected to said second arm and arranged rest upon the surface of the material operated upon ther 'by holding said cammen1ber and cam in jecting said dog, a second lever having actuating engagement with said dog for retract ing the same, and a latch carried by said lever for holding said lever with the dog'in retracted position.

9.111 a perforating machine a stop motion comprising a clutch element, an oscillatory lever, a dog arranged to be projected into the path of said lever for disengaging said clutch element, a spring for projecting said dog, a second lever member having engagement with said dog for retracting the same, an abutment, a latch pivoted to said second lever for engagement with said abutment to thereby hold the dog retracted, and cam means carried by said first lever for slightly retracting said dog to thereby relieve the latch of the tension of the spring, and permit the ready disengagement of the latch from the abutment.

10. In a perforating machine, in combination, a stop motion comprising a rotary shaft, a clutch element rotating therewith and slidable thereon and having a cam groove therein, a lever-member pivoted between its ends and having one end engaging said cam groove to be oscillated thereby, a slidable dog arranged to be projected into the path of the other end of said lever, resilient means for projecting said dog, a second lever having one end thereof in engagement with said dog for retracting the same, a loosely supported bar engaging the other end of said. second lever, and means for lifting said bar to thereby retract said dog.

11. In a ierforatin machine a sto mo* tion comprising a clutch element, an oscillatory lever, a dog arranged to be projected into the path of said lever for disengaging said clutch element, a spring for projecting said dog, a second lever-memher having engagement with said dog for retracting the same, a third lever, a bar loosely resting thereupon and engaging said second lever and means for moving said lever.

1?). ln a perforating machine, in combination, perforating mechanism, a drive mechanism therefor including a. clutch device, mechanism controllable by the operator and including a reciprocating member for actuating said clutch device for stopping and starting the machine, and a manually controlled. safety device shiftable into and out of positive engagement with said member for locking said mechanism against actuation when the machine is at rest.

13. In astop clutch mechanism of the class described, a main shaft, a sleeve slidable thereon, a flange fixed upon said sleeve and provided with a stop shoulder, a resiliently projected stop-dog for engagement with said shoulder to thereby stop the rotation of said shaft and means for permitting said dog to be automatically disengaged from said shoulder under excessive pressure between said parts. I

14. In a stop-clutch mechanism of the class described employing a resiliently projected stop-dog, a movable part comprising-a stopcam and stop shoulder, said dog being engageable successively with said cam and shoulder, and resilient means for normally retaining said dog in shoulder engaging position but permitting the same to become disengaged from the shoulder under excessive pressure,

15. a stop clutch mechanism of the class described, in combination, a drive shaft, a sleeve -men'1ber slidable thereon and having a flange fixed thereto, a stop cam and notch tliormed upon said flange, a stop-dog engageable with said cam and notch upon sliding of said sleeve, pivotal mounting means for said dog permitting the same to swing in a plane perpendicular to the shaft, and resilient means normally holding said dog in operative position but permitting it to swing to inoperative position upon excessive pressure thereagainst.

16. In a stop motionmechanism for perforating machines,,in combination, an abutment, a latch having an element engageable therewith, and means for periodically eliminating friction between said abutment and said element.

17. In a stop motion mechanism for perforating machines, incombination, an abutment, al -latch having a shoulder engageable therewith, means acting normally to resiliently press said shoulder into contact with said abutment, and periodically acting means for lifting said shoulder from said abutment to thereby eliminate friction between the engaging parts. i

18. In a stop mechanism, a drive member, a driven. member, means to couple said mem I bers, mechanism for actuating said means to ing means to render said actuating mecha-' nism inoperative and a finger actuated tr1pping member acting upon the last-mentioned means for effecting its abnormal operation.

19. In a stop mechanism, a drive member, a driven member, means to couple said members, mechanism for actuating said means to uncouple said members at a predetermined point in the drive cycle, means including two normally contacting members to render said actuating mechanism inoperative, and means for relatively moving said contacting members out of contact to allow said actuating means to uncouple said drive and driven members.

20. In a stop mechanism. a drive member, a driven member arranged to be coupled to said drive member, mechanism to uncouple said drive and driven members comprising two members in contact when said drive and driven members are coupled, and a plurality of independently acting means for relatively moving said contacting member out of contact to uncouple said drive and driven members.

21. In a perforating machine, in combination, a punch, operating means therefor, and automatically acting stop mechanism for stopping the operation of said operating means at a predetermined point, said mechanism including a feeler finger normally 7 supported in raised position by the material operated upon, and manualmeans for lifting said finger for introducing the material thereunder. l

22. In a perforating machine for operating upon sheet-material, perforating mecha-' nism, a stop-motionforcontrolling the operation of the same, a feeler finger adapted to engage the material, a latch member for maintaining said stop mechanism inopera tive during the normal operation of the machine, and means connected with said finger and actuated upon disengagement of the latter from the material vfor tripping said latch and thereby permitting operation of the stop mechanism, said means acting independently of the operation of said perforating mechanism.

23. In a stop-motion device of the class described, having a spring projected dog, a lever having a slotted extremity taking over said dogand engageable with an abutment thereon for retracting the same, a pivoted yokemember having a cam surface comprising a pair of depressions and an intermediate elevation, a second lever having a'member thereon engaging said cam surface, a bar resting upon said second lever and engaging said first lever, and means for oscillating said yoke member whereby said engaging membermay occupy either of said camdepressions Or the central cam elevation.

In testimony whereof, I have signed my name to this specification.

DONALD NOBLE. 

